I am facing a number of problems with my Samsung Galaxy Note Edge and I need help

[AC Question]

I bought samsung Galaxy Note edge a couple months back and since then I have been facing issues regarding battery drainage ( it drains in 3 hours of continous use even with power saving and reduced brightness), over heating and now ever since the new android update, it's slow, keeps getting stuck in which case it shuts down and restarts and most of all, it refuses my fingerprint and ask for back up password. Now before the undate, this only happened twice in 4 months. But after the update, it rejects my fingerprint 10 to 25 times a day. It also restarts spontaneously out of no where. And sometimes it stops receiving and sending messages and calls even with full bars then I have to restart my phone a couple times to get it to send texts. This happens 4 to 10 times a day and tbh it's getting annoying. I bought this phone with a lot of hopes but it's annoying me alot.